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Tumblers...rotary versus vibratory


#1

OK. No stupid questions, right?

Can I use a rotary tumbler (the lapidary kind you polish beach
pebbles in) with steel burnishing media to finish silver jewelry?
If not, is there some combination of medium that I CAN use with
the tumbler? It seems a shame to go out and buy a vibratory
tumbler (under $100 notwithstanding) if there’s already a rotary
one around.

Thanks in advance for any guidance. I have been lurking for a
while, and it’s time to come out!


#2

Hi Amy,

I don’t know if you can or not, but it is what I use with
steel shot,:o) My shot is all navette shaped and it works fine
also with gold.

Regards,

Skip

Skip Meister
@Skip_Meister
N.R.A. Endowment &
Certified Instructor
in all disciplines
Certified Illinois D.N.R.
Hunter Ed, Instructor


#3

Amy - I have been using a rotary tumbler with steel shot for
more than twenty five years. It works great. If you are
considering using a barrel that has previously been used with
abrasive powders you should probably buy a second barrel to use
exclusively with the steel shot.

Steven Brixner - Jewelry Designer - San Diego CA USA
mailto:@Steven_Brixner4
http://home.att.net/~brixner


#4

Can I use a rotary tumbler (the lapidary kind you polish beach
pebbles in) with steel burnishing media to finish silver jewelry?

Hi Amy. Others might disagree, but our tumbler at school is one
of the little rotary lapidary ones. As long as there’s a
waterproof seal, what’s the real difference? Ours works great
with a mixture of steel shot and tumbler powder/water. Might be
soap in there too. -Kieran


#5

Hi Amy,

Not a stupid question at all. And the good news is YES! you can
use a lapidary type rotary tumbler for steel shot. The question
now becomes how much shot and water do I use and what kind of
burnishing soap if any.

Basically tumbling is composed of three elements: the media (in
this case shot), the burnishing compound (soap) and water
mixtures, and the tumbler itself.

There are a variety of shapes of shot to choose from. Since you
will be running silver jewelry pieces, the best thing to do is
get a mixture of shapes that will handle most jewelry geometries.
To save you the headache, we have a mixture specially designed
for Rotary Tumblers. I don’t know the size of your tumbler but I
suspect its one of the small Thumler’s Tumblers? If so, you can
buy the small 10 lb. container of shot and that will be plenty.

There are two kinds of shot: carbon steel shot and stainless
steel shot. Both kinds are available as premixed assorted
shapes. But the carbon is usually half the price of the
stainless steel.

Carbon shot can rust so it’s important to use a burnishing
compound that has a rust preventative in it ~and~ to use plenty
of it. Once carbon shot is badly rusted it is next to impossible
to bring back. We suggest keeping a gallon of ‘Carbon Steel Shot
Cleaner’ on hand at all times in case of emergency. The minute
the shot looks grey or dull you can run it in the cleaner and
save it. (Instructions are on the bottle.)

If you choose Carbon Shot, you have to take a couple of things
into consideration when deciding what burnishing compound to use.
If you are using a rubber or rubber lined barrel, you can’t use
too aggressive a soap or it will degrade the rubber and make a
lovely grey/black mess of your shot and jewelry. For rubber
lined barrels I recommend our Burnishing Soap B (of course you
can ask other suppliers what they’d recommend as well).

If the barrel is plastic, use Burnishing Soap 70L. It’s very
aggressive and just great for carbon steel shot and won’t harm a
plastic barrel. DON’T use 70L with rubber barrels.

Stainless Steel Shot won’t rust so you can use any burnishing
compound designed for stainless steel shot, a good one is our
#44S. Stainless Steel Shot does have a tendency to turn grey
every once in a while. And grey dull shot produces, you guessed
it, grey dull jewelry. You can clean Stainless Steel Shot by
running it in your tumbler for 1/2 hour with a mixture of 50%
Coca-Cola and 50% water. Pepsi doesn’t work so well - I don’t
know why and yes I’m serious. :slight_smile: After 1/2 hour, empty out the
coke/water mixture and check the shot. Depending on how bad it
was, you may or may not have to repeat the 1/2 hour clean-up run
another time or even several more times.

The actual burnishing of your jewelry is too easy! Fill the
tumbler barrel 50%-60% full with shot. Add enough cool water to
cover the level of the shot by about 1" to 2". Add burnishing
compound in the amount specified on the label. If you’re using
Carbon Steel Shot, add a little extra (won’t hurt and definitely
will help prevent rust).

Put your jewelry in. The ratio of shot to jewelry is about 5 to
1 by volume. That’s lower than most other other types of tumbling
because a rotary tumbler with shot really rolls the pieces rather
than shakes them - so you can get more in without worrying about
them scratching each other. So by way of example, lets say I was
running dimes. In one cup of shot I could put maybe 50 dimes
easy, but if i was running silver dollars, then maybe only 20.
I’m guesstimating since I’ve never run either but the bigger the
piece, the less you should put in. “When in doubt, better to run
too few than too many” is a good rule of thumb.

The amount of time the pieces run depends on their condition
before they went in. Pieces that had parting lines sanded off
and sprues removed and sanded and pits and bumps removed, will
come out best. Remember steel shot tumbling only burnishes the
pieces. If they go in dull with parting lines, they come out
shiny with parting lines.

So if parts are well prepared, 4-5 hours is usually good. But I
know plenty of people who run them much longer, even overnite. I
don’t particularly like leaving tumblers on overnite. If
something goes wrong - well there’s no one around to stop it.

So ok, I guess I’ve rambled on long enough. Sorry for the long
windedness. I actually DO have a life - but I’m home sick and
it’s Saturday nite and here I sit sniffling and feeling sorry for
myself. :slight_smile:

Anyway I hope it helped a little. And if you have any
questions, please feel free to call me Monday at work.

Have I mentioned we have a free catalog? :slight_smile:

Best Regards,

Elaine Corwin
GESSWEIN CO. INC. USA
Bridgeport CT 06605

Phone: 203-366-5400
Orders: 1-800-243-4466
Tech Support: 1-800-544-2043 (ext 287 for me)
24 Hr. Fax: 203-335-0300
(Or just email me here anytime - this is my personal acct.)


#6

Amy, Yes you can, but the process is better in a Vibratory
tumbler. FYI, check out, if you can a magazine for Hunters, or
Guns, the vibratory tumblers there are used to polish brass
cartridge shells, much less expensive, and work quite well. Teresa


#7

I use a small Loritone rotary tumbler with a small amount of
stainless steel shot. The shot covers about 1/5th of bottom of
tumber, fill about 2/3rds full of water, add jewelry and a small
amount of polishing compound (I get it at a lapidary store, I
think its just powered detergent and cornmeal) use only about 1/2
to 1 teaspoon of the detergent. I let it run over night and next
morning have a wonderful bright polish. It wont remove
scratches, you have to pre polish to a pretty smooth finish
first. I also save the water and soap mix and can use it several
times. This works for both silver and gold. Hope this helps. Jan
http://www.designjewel.com


#8

Of course you can. Rio sells rotary tumblers for just that
purpose, and the steel finishing media too. Rotary takes longer
than vibratory, and you can’t fit as much in each barrel. But if
you’re doing smaller amounts anyway, and can plan ahead for the
time necessary, rotary is fine.

Elaine


#9

I use a rotary tumbler to polish silver. I use a combination of
steel shot and either soap and ammonia or the compounds that are
recommended with the shot. I bought most everything from Rio
Grande.

The most important thing to buy is the solution to store the
steel shot in, it keeps it from rusting.

I tumble for one to two hours and I’m happy with the results.


#10
  The most important thing to buy is the solution to store the
steel shot in, it keeps it from rusting. 

This is only true with carbon steel shot. If you buy the
stainless steel shot, which costs more to start with, you just
make sure it’s nice and dry before storing it.

Elaine